L-Histidine
Precursor to both histamine and carnosine, supporting immune response, stomach acid production, and intracellular antioxidant defense.
L-Histidine is an essential amino acid particularly important during growth periods. It's the precursor to histamine (involved in immune response, stomach acid, and neurotransmission) and combines with beta-alanine to form carnosine (an intracellular antioxidant). It plays roles in immune function, wound healing, tissue repair, and is a component of hemoglobin. Low histidine has been linked to rheumatoid arthritis and anemia.
Converted to histamine
Combines with beta-alanine to form carnosine
Important for oxygen transport
How L-Histidine works — from molecular targets to health outcomes. Click an edge to see supporting research.This visualization is in beta — pathways are being refined and expanded.
1-4g daily
Loading: Not required
Can be taken without food
| Form | Type |
|---|---|
| 💊L-Histidine powder or capsules | Recommended |
Pure L-histidine is standard. Often included in EAA blends.
Minimum: 4 weeks
Optimal: 12 weeks
Cycling: Not required
Note: Best absorbed on empty stomach. Those with histamine intolerance should be cautious.
Supported immune response
Enhanced carnosine levels
Support for wound healing
Some studies show low histidine levels; supplementation may help
Histidine converts to histamine; may reduce antihistamine effectiveness
Folic acid deficiency can cause FIGLU buildup with histidine use
Tip: Start low; avoid if histamine intolerant
Top studies from 39+ peer-reviewed papers
Maugeri S et al. • Cells (2023)
“Despite this evidence, more preclinical and clinical studies are needed to better understand carnosine's anti-tumoral activity, especially in the context of breast cancer.”
Gong J et al. • Nutrients (2022)
“This study identified obesity microbial biomarkers, providing fertile targets for the management of obesity.”
Shulpekova YO et al. • Nutrients (2021)
“The purpose of this review is to build an extraordinarily specific method of histamine cycle assessment in regard to non-allergic intolerance and its possible dire consequences that can be suffered.”
Holeček M • Nutrients (2020)
“Of concern should be findings of hepatic enlargement and increases in ammonia and glutamine and of decrease in branched-chain amino acids (valine, leucine, and isoleucine) in blood plasma indicating that HIS supplementation is inappropriate in patients with liver disease.”
Schön M et al. • Nutrients (2019)
“In this review, we aim to provide a comprehensive overview of the role of carnosine in neurological, neurodevelopmental, neurodegenerative, and psychiatric disorders, summarizing current evidence from cell, animal, and human cross-sectional, longitudinal studies, and randomized controlled trials.”
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